THD+N (Total Harmonic Distortion plus Noise)

THD+N (Total Harmonic Distortion plus Noise) is a measurement that indicates how accurately an audio device reproduces sound. It combines the unwanted distortions (harmonics) produced when amplifying a signal and any background noise. A lower THD+N value means the device preserves the original sound more faithfully, producing cleaner audio. Conversely, higher values suggest more added distortions and noise, which can degrade sound quality. Manufacturers use this measurement to compare audio equipment's fidelity, with ideally, devices aim for very low THD+N to ensure a pure listening experience.